Alfred and Judy are two 0-4-0 saddle tank steam locomotives. They were built by W. G. Bagnall for use at Par Docks in Cornwall, United Kingdom. The unusually low design was required to cope with extremely tight curves and a very low bridge under the Cornish Main Line. The locomotives are both preserved in operational condition on the nearby Bodmin and Wenford Railway and inspired the Reverend Wilbert Awdry to include them in The Railway Series of children's books as Bill and Ben. History The first ships used Joseph Treffry's artificial harbour at Par on the south coast of Cornwall in 1833. It was fully operational by 1840, when it was linked to his inland mines and quarries by a canal up the valley to Ponts Mill, where it connected with inclined tramways to Treffry's copper mines and granite quarries. The canal was supplemented by a horse-drawn tramway to Ponts Mill in 1855, while a separate tramway incline served the Par Consols mine on the hill behind the harbour. In 1860, a connection was made to the recently-opened Cornwall Railway which was carried on a viaduct and embankment between the harbour and mine. The mine closed in 1869 and the main tramway was converted to locomotive haulage as the Cornwall Minerals Railway in 1874, but wagons continued to be moved by horses within the harbour complex. Several years later a branch line was taken through an bridge beneath the Cornish Main Line to serve new china clay processing works. As well as the very low bridge, this line had a tight radius curve; these two restrictions had to be taken into consideration when buying locomotives to work at the harbour. The first steam locomotive to be put to use by the Treffry Estates was a small four-wheeled vertical boiler locomotive built by Sara and Burgess in Penryn in 1912 that arrived at Par the following year. This was supplemented by a more conventional 0-4-0ST in 1916 named Punch, a second hand Manning Wardle engine. The Sara locomotive was taken out of service in 1927 and was replaced by a Sentinel engine known as Toby. This was another four-wheeled vertical boiler locomotive, but of a much more modern design than the one it replaced. In 1932, Punch was rebuilt by the harbour staff using the Sara boiler but it only operated in this form for five years. At around this time